A sphere with radius 2.0 mm carries +1.0 ?C of charge distributed uniformly throughout its volume. What is the potential difference, VB - VA, between point B,
which is 4.0 m from the center of the sphere, and point A, which is 9.0 m from the center of the sphere? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A) 1200 V
B) -1200 V
C) 140 V
D) -0.45 V
A
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Power: A 400-W computer (including its monitor) is turned on for 8.0 hours per day. If electricity costs 10¢ per kWh, how much does it cost to run the computer annually for a 365-day year?
A. $120 B. $1200 C. $15 D. $150
Two spaceships traveling in opposite directions along parallel lines measure their own and the other spaceship's length while passing one another. The crew on spaceship A says that their ship is 1000 m long and that ship B is 800 m long. The crew on ship B says that their ship is 1000 m long and that ship A is 800 m long. At what speed does each crew say that the other ship is traveling relative to their own ship?
A. 0.36c B. 0.60c C. 0.64c D. 0.80c E. 1.25c
If you quickly plunge a room-temperature mercury thermometer into very hot water, the mercury level will
1.go up briefly before reaching a final reading. 2.go down briefly before reaching a final reading. 3.not change.
Photon Momentum: What is the momentum of a photon of light that has a frequency of 2.8 × 1014 Hz? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A. 1.5 × 1028 kg?m/s B. 2.1 × 1028 kg?m/s C. 4.4 × 1028 kg?m/s D. 6.3 × 1028 kg?m/s E. 6.2 × 1028 kg?m/s